Stop-motion for power-driven machines.



. L. E. JOHNSON & E. ERICKSON'.

STOP MOTION FOR POWER DRIVEN MACHINES.

APPLICATION FILED APR. 14, 1917.

1,243,609. Patented Oct. 16, 1917.

SHEETS-SHEET 1.-

Fig.1.

fiwemfiars: Edwardfiran, l; r remeEJa :9 VQm/M L. E. JOHNSON & E. ERICKSON;

STOP MOTION FOR POWER DRIVEN MACHINES.

APPLlCATION FILD APR. 14, I917.

Patented Oct. 16, 1917.

3 SHEETS-SHEET 2- fiwenlzzrs: Edward .Eriokson, lla/wrenoc E'Johnsom L. E. JOHNSON & E. ERICKSON. STOP MOTION FR POWER DRIVEN MACHINES.

APPLICATION FILED APR. 14. 19H.

Patented Oct. 16, 1917.

3 SHEETS-SHEET 3- i 1 I renneEJohnson,

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LA'WRENOE E. JOHNSON, or MELROS'E, AND E WARD nnroxsoiv; or CLVIFTONDALE, MASSACHUSETTS; S ID nitrcirs'on Assicnon To VICTOR snon" MACHINERY COM- PANY, OF LYNN, MASSACHUSETTS, A ccRPonArIoNor MASSACHUSETTS.

Specification of Letters Patent.

Patentedflct. 1 6, 1917.

Application filed April 14, 1917. Serial No. 162;550.

T (ZZZ whom it may concern Be it known that we, LAWRENCE E. JOHN- SON, a citizen of the United States of Amen ica, and a resident of Melrose, in the county of Middlesex and Commonwealth of Massachusetts, and Eowann ERIGKSON, a subject of the Govt. of Russia, and a resident of Cliftondale, in the county of Essex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Stop-Motions for Power-Driven Ma chines, of which the following is a specification.

This invention relates to stop motions for power driven machines, and has for its object the provision of means whereby, without undue shock, the machine may be stopped always at substantially the same point.

The invention consists primarily in a cam controlled pivoted lever for applying a brake shoe to the driving pulley at the same time the hub of said pulley is gripped by a coiled spring to prevent further rotation of said pulley. V

The invention further consists in mechanism for actuating said controlling cam by means of a clutch rotated by the belt for rotating said driving pulley.

The invention consists further in certain novel features of construction and arrange ment of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

For the purpose ofillustrating the invention one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized and that the invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and described.

In the drawings:

Figure 1 represents a vertical section on line 11 on Fig. 2 of a stop mechanism embodying the principles of the present invention.

Fig. 2 represents a vertical section of the same on line 2 2 on Fig. 1.

Fig. 3represents a vertical section of the same on line 38 on Fig. 1.

Fig. 4 represents a horizontal section through the frame and brake lever showing in plan the various locking mechanisms and devices for releasing the same. I i

Fig. 5 represents a partial section on line 5 on Fig. 3.

Fig. 6 represents'an elevation of a portion of the clutch operating mechanism, and V Fig. 7 represents an elevation of a portion of the treadle controlled releasing mechanism.

Similar characters designate like parts throughout the several figures of the drawings. v

In the drawings, 10 is a portion of the frame of a machine'having at its upper end a bearing 11 in which is mounted a revoluble shaft 12. The shaft 12 has secured to one end a pulley 18 having a groove 14: in its periphery and provided with a cylindrical hub 15 having a chamber 16 therein.

The hub 15 extends into a chamber 17 in a cylindrical member 18 loosely mounted on the shaft 12 between the bearing 11 and the inner end of the chamber 16 in the hub 15. The cylindrical member 18 is positioned within an 'annular flange 19 on said pulley 13, said flange having a peripheral groove 20 therein. The shaft 12 has also secured thereto a cam 21- or some similar operating member. ithin the chamber 17 is positioned a coiled Spring 22 normally in contact with the hub 15 and preventing the rotation of the pulley 13 independently of the member 18, one end of said spring being secured at 23 to the flange 2% of said member 18, while the other end thereof projects through a slot 25 in the end wall of said member 18, and is secured to an oscillating plate 26 mounted on an annular flange 27 formed upon the member 18. The plate 26 is provided with a toe 28 and a curved finger 29 the purposes of which will be hereinafter described.

Beneath the pulley 13 is a sheave 3O having a peripheral groove 51 in which is one complete turn of the belt 32 which in its movement rotates both the pulley 13 and said sheave in thedirection of the arrow a on Fig. 2.

The sheave 30 is mounted on a shortshaft 33 and has a cone-shaped cavity with the wall of which engages the cone clutch member 34 loosely mounted upon asleeve 35 surrounding the shaft 33. The sleeve 35 is secured in a projecting support 36 depending from the frame 10.

The cone clutch member 3% has formed integrally therewith a cam member 37 in the eccentric path 38 of which is a truck 39 on an arm #10 pivoted at 4:1 to an ear 12 on the support 36. Between the cam member 37 and the support 36 is an antifriction member 43. The sleeve 35 is provided with an annular flange 44 which isprovided with a pin 15 to which one end of a fiat spiral spring L6 is secured, the other end of which is secured to the pin-47 in the cone clutch member 3a.

To the support 36 thereis pivoted, at 18, a lever 1:9 which projects against a headed member 50 screwed into the end of the shaft 33.

The shank of the member 50 extends through a washer 51 positioned against a shoulder in the sleeve 35, and said shank also extends through an anti-friction thrust bearing 52 between which and said washer 51 is a coiled spring 53 adapted to retain the clutch members 30-34 in engagement. The lever a9 is provided with an arm 54 against the outer end of which bears the actuating rod 55 mounted in bearings 56 on the frame 10.

The upper end of the rod 55 has a semicylindrical projection 57 and a shoulder adapted to be engaged by a radial shoulder 58 on an oscillating member 59, mounted in a bearing in the frame 10 and having clamped to one end an arm 60 to the outer end of which is pivoted a rod 61, the lower end of which is connected to any usual form of treadle (not shown).

The treadle is normally retained in raised position by means of the spring 63 one end of which is secured to the frame 10. The member 59 is provided with a projecting lug 6st which during the oscillation of said member 59 is adapted to engage the toe 28 on plate 26 and move it in the direction of the arrow Z) on Fig. 2, thereby expanding the spring and releasing the grip thereof on the hub' 15 of the pulley 13. The pulley 13 is then free to rotate the shaft 12 and the cam member 21.

In the drawings the machine is shown with the various parts thereof in the position which they assume when the spring 22 is gripping the hub 15 of the pulley 13 to prevent its rotation, and with the foot just removed from the treadle and said treadle raised by the spring 63 so that the lug 6% has returned to its normal position.

In the frame 10 adjacent to the oscillating member 59 is an oscillating pin 65 on the outer end of which is a crank arm 66 having a cam portion 67 co-acting with a cam projection 68 on the head 69 of the member 59 on which said projecting lug 61 is formed.

Pivoted at 7 O to the outer end of the crank arm 66 is a bell crank lever 71 one arm of which has mounted on its outerend a roll 72 adapted to be engaged by the cam portion 73 on the periphery of the flange 19 "during the rotation of thepulley 13.

The other arm of the lever 71 is provided with a shouldered projection 74 adapted to engage the end 57 of the rod 55 and retain the clutch members 30-34: out of gripping relation during the operation of the machine. A spring 76, one end of which is secured to the lever 71, retains the cam surface 67 in contact with the peripheral surface of the head 69.

Vhen the foot is removed from the treadle and the spring 63 oscillates the member 59 to return the projecting lug 6% to its normal position, the cam 68 will operate against the cam face 67 on the crank arm 66 and move said crank arm about the axis of its pivot 65 so that the roller 72- is in'position to be struck by the'cam portion 73 as the pulley l3 continues to rotate.

Vi hen this cam portion 73 comes into contact with the roller 72 the lever 71 will be moved about the axis of the pivot and release the shouldered projection 7st from the end 57 of the rod 55 and permit this rod to be raised by the expansion of the spring 53 acting upon the member d9 provided with an arm 54 bearing against the lower end of said rod 55.

In the drawings, the shouldered projection 71 is shown in the position it assumes when it has just been disengaged from the end 57 of the rod 55 and said rod 55 has been elevated. The expansion of the spring 53 to actuate the member 49 and raise the rod 55 at the same time moves the shaft 33 endwise and causes the clutch members 30 and 34: to be brought into engagement, thereby causing these two members to rotate together.

As the sheave 30 is being rotated when brought into engagement with the clutch member 34:, thisrotation will be imparted to the cam 37 and cause it to be rotated in the direction of the arrow 0 on Fig. 3 of the drawings. This rotation of the cam mem ber 37 will cause the eccentric cam path 38 thereof to move the arm 40 outwardly about its pivot 41.

To the upper end of the arm -10 is pivoted at 77 a link 78 the opposite end of which is pivotally connected to aplunger 7 9 adapted to reciprocate in a chamber 80 of a dashpot 31 formed upon the lower end of a brake arm 82 pivoted at 83 to the frame 10. The

plunger 79, has a passage 82 extending'axially therethrough, which passage is adapted to be closed by a flexible valve member 33 when said plunger 79 is moved to the inner end of the chamber 80. v

This valve member 83 is provided with an opening 8 1 therethrough offset from the passage 82. As the plunger 7 9 moves outwardly in the chamber the valve member 83 is adapted to be slightly cupped, thereby permitting the air to enter through the passage S2and through the opening 84: into the chamber 80. The inner end of the chamber 80 is provided with a needle valve 85 having a passage 80 therethrough.

This valve 85 may be nicely adjusted to regulate the escape of air from the chamber 80 during the inward movement of the plunger 7 9. To the upper end of the brake lever 82 is pivoted at 37 a friction block 88 which fits into the V groove 20 in the annular flange 19 of the pulley 13. The purpose of this friction block 88 is to engage the walls of the V groove and retard the retation of the pulley 13 and reduce its speed to a minimum before the coiled spring 22 is permitted to grip the hub 15 of the pulley 13 to arrest its further movement.

iVhen the pulley 13 is rotated at a high rate of speed, it is necessary to apply greater friction of the friction pad 88 to retard its movement than would be the case when the pulley was rotating at a slower speed. This is accomplished automatically by means of the needle valve 85 which permits the escape from the chamber 80 ofa less amount of air through the passage 86 when the pulley is rotating at a high rate of speed than is permitted to escape when the pulley is permitted to rotate at a slow speed.

On the pivotST is a tripping lever 89 having a projecting end 90 engaging the curved finger L9 on the plate 26. The other arm of the lever 89 is provided with a roll 91 in the path of'the cam portion 92 on the periph cry of the annular flange 19. lVhen the brake shoe 88 is moved'into frictional coir tact with the walls of the V groove 20 the pivot 87 will be moved in ardlv and with the shoulders 29 90 as a fulcrum the roller 91 will be moved inwardly toward the axis of the shaft 12 into the path of the cam portion 92.

In the rotation of the pulley 13 this cam portion will contact with the roller 91 and move the lever 89 about the axis of the pivot 97 and disengage the shoulder 90 from the finger 29, thereby unlocking the plate 20. thus permitting the spring 22 to return to its normal position in contact with the periphery of the flange 15. This gripping contact of the spring with the hub 15 will prevent further rotation of the pulley 13.

The brake lever 82 is provided with an inwardly extending arm 93 which has a laterall extending lug 91 adapted to contactcwith a lug 95 on the frame 10 to limit the outward movement of the brake shoe 88. In the forward end of the arm 93 is mounted a rod the upper end of which is pivoted at 97 to the cylindrical member 18 thereby regulating the movement of said member 18 about the axis of the shaft 12. This member 18 is provided with a lug 98 which is adapted to contact with a portion of the frame 10 and remain in contact therewith when the stop mechanism has been fully ar rested.

The rod 90 is threaded at 99 and has adjustably mounted thereon a nut 100 against the upper end of which rests a washer 101 vithin the chamber 102 and in the upper portion of the arm Between a shoulder 103 on the rod 90 and said washer .101 is interposed a strong coiled spring 10% Normally the washer 101 is slightly removed from the inner end of the chamber 102 as indicated in Fig. 3 of the drawings. The lower portion of the arm 93 is also provided with a chamber 105 in which is positioned a lighter spring 106, the inner end of which bears against the inner end of said chamber. 'The outer end of the spring 106 bears against a nut 10? adjustably mounted upon the lower end of the rod 90. hen the shoulder 90 on the tripping lever 89 re-' leased from the finger 29 the cylindrical member 18 will be moved in the direction of the arrow (Z on Fig. 3 of the drawings by the momentum of the rotating pulley 13. In this rotation. the rod 96 will. be moved downwardly until the washer 101 comes into contact with the inner wall of the chamber 102, thereby compressing the spring 101. At this time the stop lug 93 is moved slightly away from the frame 10.

Atthe same time that the spring 101' is compressed additional-friction isapplied to the pulley 13 to stop the momentum thereof and when the speed has been retarded sufficiently the spring we will again expand to move the rod 96 upwardly and rotate the cylindrical member 18 inthe opposite direction until the lug 98 comes into contact with the frame.

In order to provide a means whereby additional friction may be applied to the pul ley 13 when desired without necessitating further expansion of the main gripping spring 22, the construction of connection between the rod 90 and the forward end of the arm 93 is provided. it is obvious that when'the forward end of the arm 93 is moved upwardly the upper end of the brake lever 82 with the shoe 8S pivoted thereto will be moved outwardly and release the frictional contact upon the pulley 13. This is objectionable as it is desired to provide some means whereby the friction upon the pulley will be continued even when the stop lug 98 is in contact with the frame 10.

It obvious that when the lug 98 is in contact with the framefurther movement of the rod 96 is prevented. hen the brake arm 82 is moved about its pivot 83 to apply more pressure to the pulley 13, the forward end of the arm 93 moved downwardly compressing the spring 106 without effecting any movement of the rod 96.

The outward movement of the lever 89 is limited by the stop member 108 and the said lever 89 is normally retained in contact with said stop member 108 by means of the spring 109 positioned in the lug 110 on the brake lever 82.

in the normal position of the cam 37 the roll 39 on the end of the lever a0 is in contact with the inner end of the eccentric cam groove 38 and when the cam member 37 has been rotated about the axis of the shaft to move the plunger 79 inwardly into the chamber 80, thereby causing the operation of the braking lever 82 and stopping the rotation of the pulley 13, the spring 46 is simultaneously wound up.

As soon in the operation of the stop mechanism the clutch members 30 and 34; are separated, the clutch member 3a is free to be moved about the sleeve and at this time the spring etfl will uncoiland return the cam member 37 to its normal position with the roller 39 at the inner end of the cam groove 38, as shown in Fig. 3 of the drawings.

t is believed that the operation and many advantages of this invention will be fully understood'from the foregoing description.

Having thus described our invention, we claim: 7

1. In a device of the class described, the combination of a driving shaft; a pulley secured thereto havinga hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in said disk while the other end is secured to said flange; and means coacting with the projecting end of said spring for releasing the spring from contact with said hub.

2. in a device of the class described, the combination of a driving shaft; apulley secured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of suit spring projecting through a slot in said disk while the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring is secured; and means for moving said plate about the aXis of said shaft thereby releasing the spring from contact with said hub.

3. In a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange surr11 nding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said sp projectingthrough a slot in said disk while the, other end is secured to said flange; plate loosely mounted on said shaft and to which the projecting end of said spring is secured, said plate having a projecting toe; and a pivoted member adapted to be moved into contact with said toe, thereby moving said plate about the axis of said shaft and releasing the spring from contact with said hub. l

4. In a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed betweensaid flange and said hub and normally engaging the periphery of said hub, one end of '6. spring projecting through a slot in said disk while the other end is secured to said flange; a plate loosely mounted on said shaft and to whichthe projecting end of said spring secured, said plate having a projecting is toe; and a treadle actuated pivoted member adapted to be moved into contact'with said toe, thereby moving said plate about the axis of said shaft and releasing the spring from contact with said hub.

in a device of the class described, the combination of a driving shaft; a pulley se cured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; aspring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in said disk while the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring is secured, said plate having a shouldered linger; means for moving said plate about the axis of said shaftto release the spring from contact with said hub; and a member coacting with said shouldered finger to lock said plate from reverse movement.

6. in a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said. flange andsaid hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in said disk while the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring is secured, said plate having a shouldered flngenmeans for moving said plate about the axis of said shaft to release the spring from contact with said hub; a member coacting with said shouldered finger to lock said platefrom reversemovement; and means for releasing said locking 1nem 7. In a device of the class described, the combination of a driving shattya, pulley secured theretohaving a hub; a disk on said shaft having an annular flange,surrounding said hub a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in said disk hile the other end issecured to said flange; a plate loosely mounted on said shat't and to which thcprojecting end of said s ing is secured said plate having a shouldered finger; means for moving said plate about the axisol saidshaft torelease the spring from contact with, said hub; a member enacting vvith said. shouldered finger to lock saidv plate for reverse movement; and means rotatable ith said pulley for releasing said locking member. a a

S In a device ofthe: class described, the combination of a drivingshaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange, surrounding said hub a spring interposed between said flan and said hub and normally engaging the periphery at said hub one end ot d spring projecting through a slot in said disk hile the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring secured, saidlplate having a sln:uldered. finger means for moving said plate abcut the axis of said shaft to release the spring from contactq vith saidhub; a pivoted member coacting With said shouldered linger to lock said plate from v reverse movement and provideduith an operating arms. .nd a rain rotatable with said pulley for engaging said arm and releasing said member from engagement with said linger.

9 In a device of the class described the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of saidhub, one end of said spring project" througha slot in said disk while the other end is secured to said flange; a pivoted brake lever: a shoe thereon adapted to engage said pulley; a tWo armed lever pivoted to said brake lever With one arm provided with a hooked projection; an oscillating plate to which is secured the projecting end of said spring said plate having a hooked finger adapted toengage said hooked projection; a cam rotatable With said pulley; a roll on the other-arm of said two armed lever; and means for moving said brake lever about its pivot to bring said roll in the path ,ot said cam.

while the other end is secured to, said flan 'e" i i {3 .7

a pivoted brake lever; [a shoe thereon adapt- L ed to engage said pulley; a two armed lever pivoted to said brake lever with onearm provided. with a hooked projection; an osclllating plate to .vhlch is secured the projec-ting end ofsaid spring, said plate having I a hooked finger adapted toengage. said hooked projection; a cam rotatable with said pulley; a roll on the other arm of said two armed lever; means for moving said brake lever about its pivot to bringsaid roll in the path of said cam; a stop to limit the outward movement of the hooked projection; and means for forcing said projection toward said stop. v

ill in a device of the class described the combination ofa driving shaft;- a pulley secured thereto having a hub; a disk on said shai'thavin g an annular flange surrounding said hub; a helical spring between said hub and flange and normally in gripping contact with said hub, one end ofsaid spring being secured to said flange and theaother end projecting through a slot in said disk; an oscillating member to which said projecting end of said spring is secured; means under the control of the operator for moving; said oscillating member in one direction to expand said spring; and means co acting with said oscillating member for locking said member with the spring expanded, 1

12-. In a device of the classdescribed, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an said hub; a helical spring between said hub and flange and normally in gripping contact with said hub,- one end of said spring being secured to said flange and the other end projecting through a slot in said disk; an oscillating member to which said projecting end of said spring is secured; means under theiccntrol of the operator for moving said oscillating member in one direction to expand said sprin means coacting with said oscillating member for locking said member v ,With the spring expanded; and means rotatable With said pulley for releasing said locking means. l

13. In a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a diskon said shaft having an annrdar flange snrrour. said hubcand a stop lug on said disk annular flange siu'rounding mally contacting with a fixed part of the frame; a helical spring between said hub and flange and normally in gripping contact with said hub, one end of said spring being secured to said flange and the other end projecting through a slot in said disk; an oscillating member to which said projecting end of said spring is secured; means under'the control of the operator for moving said oscillating member in one direction to expand said spring; and means coacting withsaid oscillating member for locking said member withthe spring expanded.

14. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a. member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for nor mallypreventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permitits rotation; at pivoted lever; a pulley engaging brake shoe carried by said l ver; and a cam for controlling the move ment of said lever-about its pivot.

15. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to' oscillate on said shaft; a device inter posed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; and an eccentric cam for controlling the movement of said lever about its pivot.

16. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate 011 said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by sald lever; a pivoted arm; a link between said arm and lever; and a cam for controlling the movement of said lever about its pivot.

17. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device inter posed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permitits rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; a pivoted arm; a link between raid arm, and lever; a cam for controlling the movement of said lever about its pivot; means rotatable with said pulley formoving said cam in one direction; and

posed between said member and, pulley for normally preventing the rotation of said pulley independently of said Z member;

-means for releasing said device from said pulley to permit its rotation; a pivoted lever; pulley engaging brake'shoe carried by said lever; a pivoted arm; a roller in the end thereof; a link between said lever and arm; and an oscillatingdisk having an eccentric cam path in which said rolleris positioned.

19. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to, oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulleyto permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; adash pot on said lever; a plunger therein; and cam'mechanism for controlling the inward movement of said plunger.

20.111 a device of the class described, the combination ofa driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; adevice interposed between said member and pulley for normally preventing the rotationof said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; a dash pot on said, lever; a plunger. therein; a pivoted arm; a link between said arm and plunger; a roll on the end of said arm; and a revoluble disk with an eccentric cam path in which said roll is positioned.

21. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normallypreventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; an arm on said lever; a rod yieldingly mounted in said arm and con nected at its opposite end with said oscillating member; and cam controlling the movement of said lever about its pivot.

09 In a device of the class described, the

nts-o9 combination of a driving shaft; a pulley se cured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; an arm on said lever having alined shouldered cavities in opposite sides thereof connected by an opening of less diameter; a shouldered rod connected at one end to said oscillating member and having at theopposite end a reduced shank extending through said opening; a nut on the outer endot said shank; a spring between the shoulder on said rod and the bottom of one cavity; a lighter spring between said nut and the bottom of the other cavity; a lug on said oscillating member limiting its movement in one direction; and a cam controlling the movement of said lever about its pivot.

23'. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally tn'eventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brakeslioe carried by said lever; an arm on said lever having alined shouldered cavities in opposite sides thereof connected by 'an"opening of less diameter; ashouldered rod connected at one end to said oscillating member and having at the opposite end a reduced threaded shank extending through said opening; an adjustable sleeve on" said threaded shank; a nut on the outerend of said shank; a spring between the shoulder on said rod and the bottom of one cavity; a washer between said'spring and the end of'said sleeve; a lighters'pring between said nut andthe bottom'of the other cavity; a lug on said oseillating member limiting its movement in one direction and a' cam controlling the movement of said lever about its pivot. V

2a. In a device of tlie class'described, the combination of a driving shaft;a"pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally fn'eventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a'pivoted'lever; a pulley engaging br'ake shoe carried by said le er; an arm on said lever; a ma yieldingly mounted in said arm and connected at its opposite end with said oscillating member; and nieans controll'ing the niovement of said lever about its pivot,

In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposedbet-ween said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; an arm on said lever having alined shouldered cavities in opposite sides thereof connected by an opening of less diameter; a shouldered rod connected at one end to said oscillating member and having at the opposite end a reduced shank extending through said opening; a nut on the outer end of said shank; a spring between the shoulder on said rod and the bottom of one cavity; a lighter spring between said nut and the bottom of the other cavity; a lug on said oscillating member limiting its movement in one direction; and means controlling the movement of said lever about its pivot.

In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried bysaid lever; an arm on said lever having alined shouldered cavities in opposite sides thereof connected by an opening of less diameter; a shouldered rodconnected at one end to said oscillating member and having at the opposite/ end a reduced threaded shank extending through said opening: an adjustable sleeve on said threaded shank; a nut on the outer end of said shank; a spring between the shoulder on said rod and the bottom of one cavity; a washer between said spring and the end of said sleeve; a lighter spring between said nut and the bottom of the other cavity; a lug on said oscillating member limiting its movement in one direction; and means controlling the movement of said lever about its pivot. v

27. Ina device of the class described. the combination of a driving shaft; a pulley secured thereto; a member loosely mounted tooscillate on said shaf a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; and revoluble means for controlling the movement of aid lever about its pivot.

28. In a device of the class described, the

combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for nor mally preventing the rotation of said pulley independently of said member; means for releasing said device from said'pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; a pivoted arm; a link between said arm and lover; and means coacting with said link for controlling the movement of said lever about its pivot. 7

2-9. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; a pivoted arm; a link between said arm and lever; a cam for controlling the movement of said lever about its pivot; means rotatable with said pulley for moving said cam in one direction; a spring for returning it, to its normal position; and means revoluble with said pulley for actuating said cam.

30. In a device of the class described the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley,

engaging brake shoe carried by said lever; a pivoted arm; a roller in the end thereof; a link between said lever and arm; an oscillating disl having an eccentric cam path in which said roller is positioned; and means revoluble with said pulley for actuating said cam.

31. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; apulley engaging brake shoe carried by said lever; a dash pot on said lever; a plunger therein; cam mechanism for controlling the inward movement of said plunger; and means revoluble with said pulley for actuating said camp i 32. In a device of the class described the combination of'a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a deviceinterposed naaaeoe between saidmember and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from' "said pulley to permit its rotation; a pivoted lever; a pulley en aging brake shoe carried by said lever; a dash pot on said lever; a plunger therein; a pivoted arm; a link between said arm and plun er; a roll on the end of said arm; a revcluble disk with an eccentric cam path'in which said roll is positioned; and means revoluble with said pulley for rotating said disk.

33. In a device of the class describe'ch-the combination of a driving shaft; a pulley secured thereto; a: member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lever; a pulley engaging brake shoe carried by said lever; and means for controlling the movement of said lever about its pivot.

34. In a device of the class described the combination of a driving shaft; a pulley secured thereto having a hub; a disk on. said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting'through a slot in said disk while the other end is secured to said flange; a brake mechanism for said pulley; and means coacting with the projecting end of said spring for releasing the spring from contact with said hub, andfsimultaneously releasing said brake mechanism from said pulley.

35. In a device of the class describechthe combination of a driving shaft; a pulley secured thereto having a hub; a diskon said shaft having an annular flange surrounding said hub; a spring interposed between said flange andsaid hub and normally engaging the peripheryof said hub, one end of said spring projecting througha slot in said disk while the other is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring is secured; a brake shoe normally in contact with said pulley; and means for moving said plate about the axis of said shaft thereby releasing the spring from contact with said hub and simultaneously re leasing said shoe from contact with said pulley. t

36.,1n a device of the class described, the combination of a drivingshaft; a pulley secured thereto having a hub provided with a peripheral groove; a disk on said shaft having an annular flange surrounding-said hub; a spring interposed between said flange and said hub and normally engaging assesses the periphery of said hub, one end of said spring projecting through a slot in said disk while the other cndis secured to said flange; a plate loosely mounted onsaid shaft and to which the projecting end of said spr ng is secured. saidplate having a projecting toe; a brake shoe normally in contact with the walls of said groove; and a pivotal member adapted to be moved into Contact with said toe, thereby moving said plate about the axis of said shaft and releasing the spring from contact with said hub.

37. in a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally en aging the periphery ofsaid hub, one end of said spring projecting through a slot in said disk while the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end ofsaid spring is secure l, said plate having a projecting toe; a pivoted member adapted to be moved into contact with said toe, thereby moving said plate about the axis of said shaft and releasing the spring from contact with said hub; and means under the control of the operator for actuating said pivoted member.

38. In device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in said disk while the other end is secured to said flange; a plate loosely mounted on said shaftand to which the projecting end of said spring is secured, said plate having a shouldered finger; means under the control of the operator for moving said plate about the m or said shaft to release the spring from contact with said hub; and a member meeting with said shouldered finger to lock said plate from reverse movement.

39. In a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub and provided with a peripheral cam projection; a disk on said shaft having an annular flange surrounding said hub; a sprin interposed between said flange and said hub and nor ly engaging the periphery.- of said hub, one end of said spring proje ting through a slot in said dish while the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring secured, said plate having a shouldered finger; means under the control of the operator for moving said plate about the axis of said shaft to release the spring from contact with said hub; a

pivoted member coacting with said shouldered finger to lock said plate from reverse movement and provided with an arm adapted to be engaged by said cam projection; and means for moving inwardly the pivot of said locking member to cause the arm of said lever to be moved into the path of said cam projection to be engaged thereby in the rotation of thepulley whereby the pivoted member will be moved about its pivot and disengage said locking member from said shouldered finger.

40. In a device of the class described, the combination of a driving shaft; a pulley s' cured thereto having a hub and provided with a peripheral cam projection; a disk on said shaft having an annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in'said disk while the other end is secured to said flange; a plate loosely mounted on said shaft and to which the projecting end of said spring is secured, said plate having a shouldered finger; means for moving said plate about the axis of said shaft to release the spring from contact with said hub; a member coacting with said shouldered finger to lock said plate from reverse movement and normally out of the path of said cam projection; and means for moving said member into position to be engaged by said cam projection whereby said locking member may be released from engagement with said shouldered finger during the rotation of said pulley.

41. In a device of the class described, the combination of a'driving shaft; a pulley secured thereto having a hub and provided with a peripheral cam projection; a disk on said shaft having an annular .fiange surrounding said hub; a spring interposed between said tlanm and said hub and normally engaging theperiphery of said hub, one end of said spring being secured to said flange; a plate loosely mounted on said shaft and to which the other end of said spring is secured, said plate having a shouldered finger; means for moving said plate about the axis of said shaft to release the spring from contact with said hub; a pivoted member 00- act-ing with said shouldered finger to lock said plate from reverse movement and provided with an operating arm out of the path of said cam project-ion when said member and finger are engaged; and means for mov ing said arm into the path of said projection whereby said arm may be moved about its pivot and said member released from engagement with said finger.

a2. In a device of the class described, the combination of a driving shaft; a pulley secured thereto having a hub; a disk on said ecting shaft having an annular flange surrounding air luib; a spring interposed between said and said hub and normally engaging periphery of said hub one end of said projecting beyond said disk while lever about pivot to bringsaid roll into the path of said cam; and yielding means for moving said bralre lever about its pivo 13. in a device of the class described, the

combination of a driving shaft; a pulley secured thereto having a hub; a dish on said shaft having annular flange surrounding said hub; a spring interposed between said flange and said hub and normally engaging the periphery of said hub, one end of said spring projecting through a slot in said disk while the other end is seen ed to said flange; a pivoted brake lever; a shoe thereon adapted to ennagesaid pulley; a two armed lever said brake lever with one arm l a hooked projection; an oscilate to which is secured the projectof said spring said plate having finger adapted to engage said I iec' ion; a cam rotatable with said pulley; a two armed lever; means for moving said brake lever about its pivot to bring said roll in the path of said cam; a stop to limit the or vnerd movement the hooked projecti ,7 means for forcing said projection to 7 l sto i; and yiei ling means for moving said b l' lever about its pivot.

a dei the class described, the combinati n of a (i riving s raft; a pulley secured thei to ha ing a huo; a disk on said shaft having an annular iiangesurrounding said hub; a helical spring between said hub anl flange and normally in gripoingcontact vi h said hub one end of said spring being secured to said and the other end probeyond said dish; an oscillating projecting end of u i s i g A i -14Jtlvto which suit.

' said spring is secured; means under the control of the operator for inovin said oscil- L s C! latin member in one direction to exnand a 1 i said spring; mechanism coactmg "Wltll: said oscillating member for loclring said member with the spring expanded; and means for releasing said locking mechanism at a predetermined point in the rotation of said pulley."

in a device of the class described, the

combination of a driving shaft; a pulley seeud is secured to said flange; a,

' andeo: and means rotatable withsaid nulcured thereto having achub; a. disk on said shaft having an annular flange surrounding said hub; a helical spring. oetween said hub and flange and normally in gripping contact with said hub, oneend of said spring being secured to said flange and the other end projecting' beyond said disk; an oscillating member to which said projecting end of said spring is secured; a pivoted lug for moving said oscillating member in one direction tel expand said spring; means under the control of the operator for moving said lug;

' means coactingwith said oscillating member for locking said member with thespring enley for releasing said locking means.

46. In a device of the class described, the combination of a drivingshaft; a pulley secured thereto having a hub; a disk on said shaft'having an annular flange surrounding. said hub and a stop lug on said disk norinally contacting with a fixed part of the frame; a helical spring between said'hub and flange and normally in gripping contact with said hub one end of said springbeingQO secured tosaid flange and the other end pro- 'ectin beyond said dislr: an oscillatin men-i b t i 0 her to which said projecting end of said spring is secured; a pivoted lug for moving said oscillating member in one direction to expand said spring; 1 con- 7'95 means the trol of the operator for moving said lug; means coacting with said.oscillatingimember for locking said member with the soring enpanded; means rotatable with said pulley for releasing said locking means; and mech- Vanism for locking said pivoted lug at the completion of its operativemove neat.

e17. In a device of the class described; the combination of ,a driving shaft; a pulley secured thereto; a

165 member loosely mounted to oscillate on said shaft levice'interposed )etween said member and pulley normally preventing the rotation of n inderendently of said iii-ember; means releasing said device from said pulley permit its rotation; a pivoted lug for actuating said, releasing means; and a member under the control otthe operator for moving said pivoted lug about its pivot.

l8. In a deviceof the class described, the combination of a driving shaft; a pulley secured thereto having a cam projection re'voluble therewith; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally prove ting the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its'rotation; a pivoted lug for actuating said releasingmeans provided with a peripheral cam; a member under the control of the operator for moving said pivoted lug aboutits pivot; a pivoted arm having a cam surface normally retained in conneaenoe tact with said peripheral cam; a two armed lever pivoted to the free end thereof, one of the arms being provided with a roll adapted to coact with the cam projection on said pulley and the other arm having :a shouldered projection; a reciprocating rod adapted to be locked in its lowest position by said shouldered projection; means movableavith said lug for lowering said rod; abrake for said pulley; a cam for actuating said brake; clutch mechanism for controlling the operation of said cam; and means actuated by said rod for actuating said clutch mecha nism.

In a device of the class described, the combination of a driving shaft; a pulley secured thereto having a cam projection revoluble therewith; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotationof saidpulley independently of said member; means for releasing said device from said pulley to permit its rotation; a pivoted lug for actuating said releasing means provided with a pcripheral cam; a member under the control of the operator for moving said pivoted lug about its pivot; a pivoted arm having a cam surface normally retained in contact with said peripheral cam; 51 twoarmed lever pivoted to the free end thereof, one of the arms being provided with a roll adapted to coact with the camprojection on said pulley and the other armhaving a shouldered projection; reciprocating rod adapted to be locked in its lowest position by said shouldered projection and having a lateral shoulder; means movable with said lug and provided with a radial shoulder adapted to coact with said lateral shoulder and effect a lowering of said rod; a brake for said pulley; a cam for actuating said brake; clutch mechanism for controlling the operation of said cam; and means actuated by said rod. for controlling said clutch mechanism.

50. In a device of the class ClGSCTllJGCl the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member. and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a sheave adapted to be driven by the pulley driving member; a clutch member coacting therewith; a brake for said pulley actuated by said clutch member; and means under the control of the operator for simultaneously disengaging said clutch member from said sheave and 'actuat iu-g said releasing means.

51. ln a device of the class described, the

combination of a driving shaft; a pulley secured thereto; a member loosely 'mounted to oscillate OIlSllCl shaftya device; interare posed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said'pulley to permit its rotation; a sheave adapted to be driven by the pulley driving member; a

clutch member coacting therewith; brake for said mlley actuated by said clutch member; and meansincluding a reciprocating rod under the control of the operator for simu taneously disengaging said clutch member from said sheave and actual-tin said releasing means.

In a device of the class described the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of saidmember; means for releasing said device from said pulley to permit its rotation; a sheave adapted to be driven by the pulley drivingmember; a

clutch member coacting therewith; a. bfalte for said pulley actuated by said clutch member; means including a reciprocating rod under the control of the operator for simultaneously disengaging said clutch member from said sheave and actuating said releasing means; and a device for locking said rod during the rotation of the driving shaft.

In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate onsaid shaft; a device interposed between said member and pulley for normally preventing the rotation .of said pulley independ ntly of-said member; means for releasing said device from said pulley to permit its rotation; a sheave adapted to be driven by the pulley driving member; a clutch member coacting therewith; a brake for said pulley; a cam rotatable with said. clutch member and adapted to actuate said brake; and means under the control of the operator for disengaging said. clutch member from said sheave and simultaneously actuatin said releasing means.

o l. In a device of the class described,

the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a sheave adapted to be driven by the pulley driving member; a clutch membercoaoting therewith; a brake for said pulley; a cam rotatable with said clutch member and adapted to actuate said brake; means under the control of the operator for disengaging said clutch member from said sheave and simultaneously actuating said releasing means; and means for rotating said cam to its normal position when said clutch member has been disengaged from said sheave. V

55. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulle independently of said member; meansfor releasing said de lce from said pulley to permit its rotation; a sheave adapted to be driven by the pulley driving member; a clutch member coacting therewith; a brake for said pulley; a cam rotatable with said clutch member and adapted to actuate said brake; means under the control of the op erator for disengaging said clutch member from said sheave and simultaneously actuating said releasing means; a support on which said cam and clutch memberare revolubly mounted; and a spring the ends of which are secured respectively to said clutch member and support whereby the cam is re turned to its normal position when said clutch member has been disengaged from said sheave.

56. In a device of the class described the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a tubular support; a shaft therein adapted to be rotated and moved endwise; a sheave on the outer end thereof adapted to be driven by the pulley driving member; a clutch member mounted on said tubular support and adapted to engage said sheave and be driven thereby; a cam rotated by said clutch member; a brake for said pulley actuated by said cam; and means under the control of the operator for moving said sheave shaft endwise.

57. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillateon'said shaft; a device interposed between said member and pulley for normally preventmg the rotation of said pulley independently, of said member; means for releasing said device from said pulley to permit its rotation; a tubular support; a shaft thereln adapted to be rotated and moved endwise; a sheave on the outer end thereof adapted to be driven by the pulley driving member; clutch member mounted on said tubular support and adapted to engage said sheave and be driven thereby; a cam rotated by said clutch member; a brake for said pulley actuated by said cam; means 1 undervthecontroi of the operator for mov- 111g said sheave shaft endwise; and means reaaeoe position when said clutch member and sheave have been disengaged.

58. In a device of the class described, the.

combination of a driving shaft; a pulley secured t ereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulley to permit its rotation; a. tubular support having a flange at its outer end; a shaft therein ad fired to be rotated and moved endwise; a sheave on the'outerend thereof adapted to be driven by the pulley driving member; a clutch member mounted on saidtubular support between said flange and the frame of the machine and adapted to engage said sheave and be driven thereby; a cam rotated by said clutch member; a thrust bearing interposed between said frame and the inner end of said clutch member; a brake for said pulley actuated by said cam; and means under the control of the operator for moving said sheave shaft endwise.

59. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said. member; means for releasing said de *ice from said pulley to permit its rotation; a tubular support; a shaft therein adapted to be rotated and moved endwise; a sheave on the outer end thereof adapted to be driven by the pulley driving member; a clutch member mounted on saidtubular support and adaptedto engage saidsheave and be driven vthereby; a cam rotated by said clutch member; a'bralre for said pulley actuated by said cam; means under the control of the operator for moving said sheave shaft endwise; a headed member in the inner end of said sheave shaft; a washer surrounding said headed ,member and bearing against an annular shoulder in the bore of said tubular sup port; a spring between said asher and the head of said headed member; andimeans under the control of the operator for foreingsaidheaded member against the tension of said spring to disengage said sheave and clutch member.

60. In a device of the class described, the combination of a driving shaft; a pulley secured thereto; a member loosely mounted to oscillate on said shaft; a device interposed between said member and pulley for normally preventing the rotation of said pulley independently of said member; means for releasing said device from said pulleyto permit its rotation; a tubular support; a shaft therein adapted to be rotated and moved endvvise; a sheave on the outer end thereof adapted to be driven by the pulley driving member; a clutch member mounted on said the control of the operator for moving said sheave shaft endwise; a headed member in the inner end of said sheave shaft; a Washer surrounding said headed member and hearing against an annular shoulder in the bore of said tubular support; a spring between said Washer and the head of said headed member; a pivoted member having an arm bearing against said headed member; and means under the control of the operator for moving; said pivoted member about its pivot. Signed by us at Lynn, Mass, this 12th day of April, 1917.

LAWRENCE E. JOHNSON. EDWARD ERICKSON.

Witnesses:

WALTER E. LoMBAnD, NATHAN C. LOMBARD.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

